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In this lesson,
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we're going to use a corner pin and an edge blur to replace the screen.
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OK, so in our last lesson,
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I challenged you to try to get Track 2 and 3 to match
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up perfectly with your corners.
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So I've gone ahead and done that in between lessons.
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If you didn't get a chance to do that,
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then you can just pick up here where we are starting
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at 09_begin in your project files.
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OK,
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so now we're ready to introduce the image that we want to
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track along with these four points.
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So go ahead and grab your Reference Files folder.
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And we're going to grab the rotating vector city.
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So go ahead and just drop that onto your timeline.
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OK, so I can kind of zoom back here a little bit.
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And you'll see that the rotating city I have is only 640 by 360,
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instead of the 1280 by 720.
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So that's going to be a little bit smaller than the
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shot that we were working with before.
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So that's going to present a little bit of an issue that
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we'll be able to clear up later on.
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But first of all, what we need to do is to add a Corner Pin node.
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So that's basically what's going to distort this data into
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fitting onto the area that we've tracked here.
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So basically, all you have to do is just have that Read node selected,
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then hit the Tab key and type in "corner.
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" And you see Corner Pin comes up.
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And that's going to give you that.
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Now what if I want to look at these two things together?
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I need to use a Merge node to be able to view the Read node of my
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vector city on top of the Read node of my footage.
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So let's just hover over our Node graph, hit the Tab key, and type in "merge.
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" I didn't have anything selected,
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so it just dropped it right there onto the node graph.
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And if you remember, the <
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B Pipe?
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>> is always going to be your background,
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so we can plug that into Tracker 2 that has all the
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background information over here of our plate.
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And then our foreground is going to be plugged into the Corner Pin node,
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which will be all of the foreground information in a moment.
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So right now,
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we've got the foreground information right here with the Corner Pin node.
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But it's not being distorted yet.
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Now, I want to view the Merge,
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so I'm going to go ahead and drop that Viewer node onto the Merge.
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So it re-sizes this for me, so that I'm seeing that full size,
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that I see how this is just kind of stuck down here.
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So because that Corner Pin node has been applied,
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you see how the 4, 3, 2, 1 is written in the corners.
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So basically, this is going to be pinned to Tracker 4.
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This will be pinned to Tracker 3.
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This corner will be to 2, and this one to 1.
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So you can see why it's important that order that I told you
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of which corner you want to be the upper,
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left-hand corner of your image is the one that you want to be Track 4,
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basically.
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That's just how the Corner Pin node works.
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So again,
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we're going to want to be hooking some data together from
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our Tracker to our Corner Pin node.
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So what I'm going to do is just close out of the Merge node for a second.
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And we don't even need the Tracker node open any more either.
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We only need the Corner Pin for now.
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And all you have to do is right-click where it says <
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2, 1?
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>> and tell to link to-- let's just pull this over here,
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just so you can see everything-- right-click,
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go to Link To, choose Tracker 2.
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And then because it says <
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2, 1?
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>> you'll choose Track 1, Tracker 2, Track 1.
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And you can see that over here-- I'm just middle-clicking-- that's
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been kind of sucked onto that Track 1 point.
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Then let's come over here and do the same for Track 2.
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So right-click over that animation menu, go to Link To, Tracker 2, Track 2.
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And then the same for 3 and 4.
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Pretty straightforward, once you get the hang of it.
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Track 4, and that looks like that is in place.
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Now sometimes,
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you're going to have a problem where your image does
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not perfectly sit on your phone.
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So it looks like ours is doing a pretty good job of snapping into that place.
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And the reason why it's doing that is because of what we had selected.
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When we dropped in the Corner Pin node, we had the Read node selected.
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But if you didn't, and then you simply hooked the Corner Pin node in,
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it might not have the right center point.
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And so you're going to have a problem.
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But all you have to do is come over here to that
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From tab and click Set To Input.
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And that's going to snap it back into place.
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So if you just did what I did and maybe you skipped that
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step of having the Read node selected, it can happen anybody.
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But it will make your image look a little weird.
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So if you're having trouble,
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if you do this on your own and your image doesn't automatically snap into place,
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try clicking Set To Input, and just see what happens,
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once you have these linked up and it still doesn't look right.
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OK, so now we have a pretty awesome looking image here.
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I mean, there's a little bit to be desired,
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as far as the way the screen is integrated.
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But we'll be able to fix that in a moment.
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But it really looks like this video is on her screen,
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as far as the way that it's deforming to those points.
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Now there's a few things that we can change to make
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it a little bit better integrated.
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So one of the first things I want to do is to add an edge blur.
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And that's just going to give this edge a little bit less
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of that hardness that you see there.
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And most screens don't project all the way to the very edge of the screen,
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so you get a little bit of black here.
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Now we've already gotten that, just because of the way we've tracked it.
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But adding edge blur is going to help even more.
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So we want that edge blur to happen after the Corner Pin,
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and before the Merge node.
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So let's go ahead.
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We'll just hover over this area here, hit the Tab key, and type in "edge.
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" Edge blur is going to pop up.
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And we'll just pop that in between the Merge and the Corner Pin node.
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And you can pull that over there.
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And then, let's just see what happens if we pull this all the way up,
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what it does.
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So I like to play with the slider to figure out how far I can push it,
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and then just figure out a good area.
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So it looks like, for this one,
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probably somewhere between 4 and 5 is a good place.
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If you feel like it's too much, maybe take it down between 3 and 4.
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And that's just going to help this area here to feel
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a little bit better integrated.
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Now in our next lesson,
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we're going to learn how to make it look even better integrated by
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reintroducing the reflections from our screen into our composite and changing
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a few other properties just to really make this shine.
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So stick around.
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And we're going to finish up the polish for this little shot in our next lesson.
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